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Fish live in waters of contaminant flux. In three urban, fish‐bearing waterways of British Columbia, Canada, we found the active ingredients of WeedEx®, KillEx®, and Roundup® herbicide formulations (2,4‐D, dicamba, glyphosate, and mecoprop) at low to high ng/L concentrations (0.26 to 309 ng/L) in routine conditions, i.e., no rain for at least one week. Following rain, these concentrations increased...